docs: def ToPhotlam(self, wave, flux, **kwargs):
          """Convert to ``photlam``.
  
          Since there is no real conversion necessary, this returns
          a copy of input flux (if array) or just the input (if scalar).
          An input array is copied to avoid modifying the input
          in subsequent **pysynphot** processing.
  
          Parameters
          ----------
          wave, flux : number or array_like
              Wavelength (not used) and flux values to be used for conversion.
  
          kwargs : dict
              Extra keywords (not used).
  
          Returns
          -------
          result : number or array_like
              Converted values.
  
          """
          if hasattr(flux,'copy'):
            return flux.copy()  # No conversion, just copy the array.
          else:
            return flux